Coated substrate having enhanced scratch and mar resistance

a technology of coating substrate and scratch resistance, which is applied in the direction of coating, transportation and packaging, layered products, etc., can solve the problems of wet scratch and mar, clearcoat finish scratches and marring continues to be a problem, and clearcoat finishes on automotive vehicles are often subject to mechanical damage, etc., to achieve enhanced scratch and mar resistance, good optical properties, good gloss and transparency

Active Publication Date: 2008-07-03
AXALTA COATING SYST IP CO LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0025]The present invention also provides for a process for coating vehicle substrates with a clear coat to form clear coat / color coat finish using the above clear coating composition containing dispersed silica nano-particles to form a clear finish having good optical properties, i.e., good gloss and transparency and having enhanced scratch and mar resistance and low VOC (volatile organic content).

Problems solved by technology

Scratching and marring of the clearcoat finish continues to be a problem for vehicle finishes, particularly, wet scratch and mar resistance of such finishes.
Clearcoat finishes on automotive vehicles are often subjected to mechanical damage caused by a variety of events during normal use.
For example, materials that come in contact with the clear coats under normal use on the roadways, such as stones, sand, metal objects and the like, cause chipping of the clear coat finish.
Keys used to lock and unlock vehicle doors cause scratches of the finish.
Automated car wash equipment and brushes cause marring and scratching of the clear coat finish.
The placement of sliding objects on the surface of an automotive vehicle such as the top of a trunk or hood causes scratches and marring.
Also, the clear coat finish is subject to environmental damage caused, for example, by acid rain and exposure to UV light.
However, such particles often cause the resulting finish to have a dull appearance and reduced transparency, which are unacceptable appearance properties for automobiles and trucks.
However, this did not significantly improve scratch and mar resistance of the clear coat finish and in some cases significantly reduced the transparency of the finish.
However, when the stratified layer is worn through or penetrated by damage caused, for example, by automatic car washing or exposure to the elements, the scratch and mar resistance performance of the finish deteriorates significantly.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

examples

[0146]The following compositions were prepared for use in the coating compositions of the examples:

Preparation of Silane Polymer 1

[0147]Acrylosilane polymer solutions were prepared by copolymerizing in the presence of a 2 / 1 Solvesso® 100 Aromatic Solvent / butanol mixture, monomer mixtures of 25 pbw styrene (S), 20 pbw hydroxypropyl acrylate (HPA), 30 pbw methacryloxypropyl trimethoxy silane (MAPTS) (Silquest® A-174 from Crompton), 2 pbw butyl acrylate (BA), and 23 pbw isobutyl methacrylate (IBMA) in the presence of 8 parts by weight of Vazo® 67 [2,2′azobis(2-methylbutyronitrile)] (available from DuPont, Wilmington, Del.). The resulting acrylosilane polymer solution has a 71% solids content and a viscosity of F-R on the Gardner Holdt scale measured at 25° C. The polymer has a weight average molecular weight of approximately 4,500 gram / mole.

Preparation of OH-Containing Containing Carbamate Silane Oligomers for Use in Silica Dispersion Preparation

Preparation of Carbamate Silane Oligomer...

examples a-p

Clearcoat Control Composition (Coating Example A)

[0157]Gen 4ES clearcoat (available from DuPont, Wilmington, Del.) was reduced with 10% wt of ethyl 3-ethoxy propionate (EEP).

Formulation of Clearcoat Compositions Incorporating above Prepared Dispersions, Coating Examples B-P

[0158]To form clear coating compositions, the aforementioned dispersions were added to 210 grams of Gen 4 Clearcoat according to Table 3 (all amounts shown in Table 3 are in parts by weight). The resulting mixture was stirred for 30 minutes and reduced with 10% wt of ethyl 3-ethoxy propionate (EEP). Table 3 summarizes the preparation of clear coating compositions A-P that were prepared and then applied as a clear coat and tested for and scratch and mar resistance. In Examples O and P, the clear coating compositions did not contain a dispersion of the present invention.

TABLE 3Ctrl.Ctrl.Ctrl.Ctrl.Ctrl.Ctrl.CtrlCtrlCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCEx. AEx. BEx. CEx. DEx. EEx. FEx. GEx. HEx. IEx. JEx. KEx. LEx. MEx. NE...

examples u -

Examples U-X

Fumed Silica Examples Showing Improved Scratch and Mar Resistance

Preparation of Fumed Silica Grind 1

[0177]To a mixing container equipped with a Cowes blade, was added 80.6 grams of Solvesso® 100, 253 grams of acrylic polyol (STY / BMA / BA / HPA) in a ratio of 15 / 30 / 17 / 38). The above mixture was mixed for 30 minutes and 57.7 grams of Aerosil® R-972 fumed silica particles were added in portions. The resulting mixture was agitated until all the particles were dispersed. The resulting dispersion was milled with a 0.8-1.0 mm Zirconia (zirconium oxide) with a media load of 1135 grams for 33 minutes at 2200 rpm to give a clear dispersion.

Preparation of Fumed Silica Grind 2

[0178]To a mixing container equipped with a Cowes blade, was added 106.2 grams of AROMATIC® 100, 169.1 grams of Silane Polymer 1 (prepared in Example 1). The above mixture was mixed for 30 minutes and 38.6 grams of Aerosil® R-972 fumed silica particles were added in portions. The resulting mixture was agitated unti...

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Abstract

Disclosed herein is a substrate comprising a coating composition of silica nano-particles having enhanced mar and scratch resistance. In particular, the invention relates to a coating composition that contains silica nano-particle dispersion for use in automotive coating applications.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims the benefit U.S. Provisional Application Ser. No. 60 / 813,458 filed on Jun. 14, 2006 and U.S. Provisional Application 60 / 858,738 filed on Nov. 14, 2006, which are hereby incorporated by reference in its entirety.FIELD OF THE INVENTION[0002]The present invention relates to a process for forming a dispersion of silica nano-particles, which in turn, are useful in preparing clear coating compositions having enhanced scratch and mar resistance.BACKGROUND OF THE INVENTION[0003]Basecoat / clearcoat (pigmented coating overlaid with a clearcoat layer) finishes for vehicles, such as, automobiles and trucks, are currently being widely used. Typically, such finishes are produced by a wet-on-wet method. In the method for applying a basecoat / clear coat finish, a basecoat (commonly referred to as a color coat) containing color pigment and / or special effect imparting pigment, is applied and flash dried for a short period of time, but ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B32B5/16C09D7/62
CPCB82Y30/00Y10T428/254C01P2004/64C08K3/36C08K5/0025C08K9/04C08K9/08C09C1/3081C09D7/1225C09D7/1266C09D7/1275C09D7/1283C09D133/066C09D143/04C09D201/02C01P2004/62C09D7/62C09D7/67C09D7/68C09D7/69Y10T428/31692Y10T428/31663Y10T428/25
Inventor LIN, JUN
Owner AXALTA COATING SYST IP CO LLC
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